Print Email Facebook Twitter A Dictionary Learning Approach for Joint Reconstruction and Denoising in Low Field Magnetic Resonance Imaging Title A Dictionary Learning Approach for Joint Reconstruction and Denoising in Low Field Magnetic Resonance Imaging Author Ahishakiye, Emmanuel (Kyambogo University; Mbarara University of Science and Technology) van Gijzen, M.B. (TU Delft Numerical Analysis) Shan, X. (Harbin Institute of Technology) Tumwiine, Julius (Mbarara University of Science and Technology) Obungoloch, Johnes (Mbarara University of Science and Technology) Date 2021 Abstract Currently, many children with hydrocephalus in East Africa and other resource-constrained countries do not have access to Magnetic Resonance Imaging (MRI) scanners, the preferred imaging tool during the disease administration and treatment. Conventional MRI scanners are costly to buy and manage, which limits their utilization in low-income countries. Low-field MRI scanners can offer an affordable, sustainable, and safe imaging alternative to high-field MRI. However, they are associated with a low signal-to-noise ratio (SNR), and therefore the images obtained are noisy. In this study, we propose an algorithm that may help to alleviate the drawbacks of low-field MRI by improving the quality of images obtained. The proposed algorithm combines our previous proposed algorithm known as AS-DLMRI for image reconstruction and a nonlinear diffusion filter for image denoising. The formulation is capable of removing additive zero-mean white and homogeneous Gaussian noise, as well as other noise types that could be present in the original signal. Experiments on visual quality revealed that the proposed algorithm is effective in denoising images during reconstruction. The proposed algorithm effectively denoised a noisy phantom, and a noisy MRI image, and had better performance when compared to DLMRI and AS-DLMRI in terms of Peak Signal to Noise ratio (PSNR) and High-Frequency Error Norm (HFEN). Integrating AS-DLMRI and the nonlinear diffusion filter proved to be effective in improving the quality of the images during the experiments performed. The hybrid algorithm may be of great use in imaging modalities like low-field MRI that are associated with low SNR. Subject MRIlow-field MRIimage reconstructionDictionary learningImage denoising To reference this document use: http://resolver.tudelft.nl/uuid:188064e2-1680-490e-8ca1-216c1ff4c6ca Publisher IEEE, Danvers Embargo date 2022-03-31 ISBN 978-1-6654-4830-7 Source 2021 IST-Africa Conference (IST-Africa): Proceedings Event 2021 IST-Africa Conference, 2021-05-10 → 2021-05-14, Virtual conference, South Africa Bibliographical note Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public. Part of collection Institutional Repository Document type conference paper Rights © 2021 Emmanuel Ahishakiye, M.B. van Gijzen, X. Shan, Julius Tumwiine, Johnes Obungoloch Files PDF A_Dictionary_Learning_App ... maging.pdf 2.75 MB Close viewer /islandora/object/uuid:188064e2-1680-490e-8ca1-216c1ff4c6ca/datastream/OBJ/view